https://fedorahosted.org/389/ticket/47330
https://fedorahosted.org/389/attachment/ticket/47330/0001-Ticket-47330-ch...
Bug Description: Upgrading from db4 to db5 was not implemented
in changelog db code.
Fix Description: Implemented upgrading changelog db from db4
to db5. The db extension for db4 is ".db4"; for the newer
BDB version, it is ".db" without the major version number.
This is the same format as the main db.